I did not see your second post!
area=. ] * 50 - %&2
area(max=. (>./) @:) 0 to 100
1250
max
>./@:
On Sat, Feb 23, 2013 at 1:46 PM, km <k...@math.uh.edu> wrote:
> Can we have an adverb Max so that f Max y finds the maximum of f on
> the list y ?
>
> Sent from my iPad
>
>
> On Feb 23, 2013, at 12:03 PM, Aai <agroeneveld...@gmail.com> wrote:
>
> > With some math in J
> >
> > x : length barn side
> > -->the other rectangle side is then
> > -: 100 - x
> >
> > i.o.w. we have
> > A = x (50 - x/2)
> >
> > with J
> >
> > 0 1 +//.@(*/) 50 _0.5
> > 0 50 _0.5
> >
> > first derivative
> >
> > 0 50 _0.5&p. d. 1
> > 50 _1&p.
> >
> > second derivative
> >
> > 0 50 _0.5&p. d. 2
> > _1"0
> >
> > --> a maximum for
> >
> > 1{:: p. 50 _1
> > 50
> >
> > --> maximum (rectangular) area
> >
> > 0 50 _0.5&p. 50
> > 1250
> >
> >
> >
> >
> >
> > On 23-02-13 15:42, km wrote:
> >> Use J to solve the farmer's fence problem:
> >>
> >> A farmer with 100 meters of wire fence wants to make a rectangular
> chicken yard using an existing barn wall for one of the north-south sides.
> What is the largest area he can enclose if he uses the 100 meters of fence
> for the other three sides, and what are the dimensions of the largest-area
> chicken yard?
> >>
> >> Kip Murray
> >>
> >> Sent from my iPad
> >>
> >> ----------------------------------------------------------------------
> >> For information about J forums see http://www.jsoftware.com/forums.htm
> >
> > --
> > Met vriendelijke groet,
> > @@i = Arie Groeneveld
> >
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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